FUNCTIONS OF SOIL AND WATER CONSERVATION BY GRASS HEDGEROW INTERCROPPING OF SLOPE ORCHARD IN THREE GORGES RESERVOIR AREA
FUNCTIONS OF SOIL AND WATER CONSERVATION BY GRASS HEDGEROW INTERCROPPING OF SLOPE ORCHARD IN THREE GORGES RESERVOIR AREA
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发表时间：
2008
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通讯作者：
Liao Xiao-yong;Luo Cheng-de
中科院分区：
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作者：
Liao Xiao-yong;Luo Cheng-de
坡地果园土壤流失是三峡库区生态环境和农业可持续发展面临的严重问题。防止水土流失和提高坡地果园产量是草篱间作的主要目标。以传统果园模式为对照，对草篱间作的径流、泥沙等生态效应进行了为期5年的系统试验研究。结果表明，该模式能有效减少紫色土坡果园的水土流失。尤其是土壤侵蚀量的减少更为明显，与传统果园模式相比，径流量减少58.71%~ 65.74%，土壤侵蚀量减少70。70%~ 77.92%。在典型的短历时、高强度降雨条件下，草篱间作对产流产沙过程具有明显的延时和延缓作用。此外，草篱间作还能明显减少养分流失总量，从而保持土壤肥力，提高土地生产力，减少非点源污染。建议在三峡库区广泛推广该试验模式，为三峡库区农业可持续发展和生态环境保护做出贡献。
The soil loss of slope orchard is a serious problem on both eco-environment and sustainable agri- cultural development in the Three Gorges Reservoir Area. Preventing soil erosion and improving productiv- ity of slope orchard is the main target of grass hedgerow intercropping. Taking traditional orchard pattern as a control,five year's trail systematical study on ecological effects,including runoff and sediment collec- ting,of grass hedgerow intercropping was carried out. The results showed that this model could effectively reduce soil and water loss of purple soil slope orchard. Especially, the decrease of soil erosion amount is more evident in comparison with traditional orchard pattern—runoff amount decreased by 58.71%～65.74%,soil erosion amount decreased by 70. 70%～77.92%. Under the typical short duration and high in- tensity rainfall, grass hedgerow intercropping played an important role in time delaying and postponing process of runoff and sediment yield. Besides,grass hedgerow intercropping could obviously decrease total amount of nutrient loss,so as to keep soil fertility and improve productivity of land and decrease non-point pollution. It was proposed that this trial model should be widely extended to contribute greatly to sustain- able agricultural development and eco-environmental protection in the Three Gorges Reservoir Area.